Why is our Yorkie puppy biting and licking one fastener for days?

Our 1 yr old Yorkie is licking and biting one of her nail (the middle one) on her paw incessantly for days and will NOT stop.

I cannot get her to a vet until Friday and we are really worried around this. We have inspected the entire paw and played next to her nails and "toes" to see if she exhibits signs of any loving of pain but she does not.

Does anyone enjoy a guess as to what this could be about? She did own a bath 2 weeks ago but this did not start until 4 days ago so I believe it is unrelated. They're both (sisters) outstandingly small house dogs so they are never outside. Thanks very much.
Answers: the staple maybe too long
I don`t know an ingrown nail


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